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It doesnt matter whether you run 1 instance of superpi across all 4 cores , or run 4 instances , 1 one each.....it's 17 seconds for 1M calculation.;
Here's 2 cores , assigned affinity to 1 core each ;

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Sisoft Sandra benches : Comparison against top processors from AMD and Intel , including the processor I am upgrading from , the Intel e6600.

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I wasn't sure I'd notice the upgrade that much or not from the e6600 ,but wow , I'm impressed.
Boot time is down 4 seconds .
Pretty much everything works faster.
I'm still working on the baseline numbers , more data to follow.
Also , while I generally don't OC my main rig , I'll be doing some quicky OC's just for a lark ,and more data.